Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D295/00—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms
  • C07D295/16—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms acylated on ring nitrogen atoms
  • C07D295/18—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms acylated on ring nitrogen atoms by radicals derived from carboxylic acids, or sulfur or nitrogen analogues thereof
  • C07D295/182—Radicals derived from carboxylic acids
  • C07D295/185—Radicals derived from carboxylic acids from aliphatic carboxylic acids

Definitions

• This invention relatesto new carbamic esters, to processes for their preparation, and-herbicidal compositions containing them.
• Ar represents a phenyl or chloro-substituted phenyl group and R represents an alkyl group containing 1 to 4 carbon atoms.
• racemic and optically active D forms of the compounds of Formula I may be obtained by reacting an aryl isocyanate of the formula Ar-NCO with the racemic or optically active D form of a hydroxyamide of the general formula:
• reaction is preferably carried out in an inert organic solvent medium, preferably an aromatic hydrocarbon such as benzene, and at a temperature between 15 and 150 C.
• an inert organic solvent medium preferably an aromatic hydrocarbon such as benzene
• racemic and optically active D forms of the compounds of general Formula I may also be prepared by reacting an amine of the formula H NR with the racemic or optically active D form of a compound of the formula:
• the starting materials of general Formula III may themselves be prepared by the reaction of an isocyanate of the formula ArNCO with an ester of a racemic or optically active D form of a hydroxy acid of the general CH (IV) wherein Y represents a halogen atom, and the other symbols are as hereinbefore defined.
• the reaction may be carried out with or without a solvent in the presence of an acid-binding agent, such as an alkali metal derivative or a tertiary amine, and at a temperature between 0 and C.
• an acid-binding agent such as an alkali metal derivative or a tertiary amine
• a solvent is preferably an aromatic hydrocarbon such as benzene or toluene.
• the racemic and optically active D forms of the carbamic esters of the present invention have remarkable selective herbicidal properties. They can be used to destroy weeds, more especially grasses, such as wild oats (Avena fatua), perennial rye grass (Lolium perenne), Echinochloa (Echinochloa crusgalli), Setari-a (Setaria faberii), Digitaria (Digitaria sanguinalis) and foxtail (Alopezcurus pratensis) amongst crops such as onion, radish, rapeseed, mustard, cress, beet, lucerne, clover, broad bean, French bean, pea, lentil, carrot and sunflower without damage to the crop at normal doses required to destroy the weeds.
• grasses such as wild oats (Avena fatua), perennial rye grass (Lolium perenne), Echinochloa (Echinochloa crusgalli), Setari-a (Setaria
• herbicidal compositi ns containing at least one carbamic ester of general Formula I in association with one or more diluents compatible with the carbamic ester or esters and suitable for use in herbicidal compositions.
• the compositions Preferably contain between 0.005 and 50% by weight of carbamic ester.
• the compositions may be solid if there is employed a powdered solid compatible diluent such as talc, calcined magnesia, kieselguhr, tricalcium phosphate, powdered cork, absorbent carbon black or a clay such as kaolin or bentonite.
• compositions may take the form of aerosols, suspensions, emulsions or solutions in organic or aqueous organic media, for example aromatic hydrocarbons such as toluene or xylene or mineral, animal or vegetable oils, or mixtures of these diluents.
• compositions in the form of dispersions, solutions or emulsions may contain wetting, dispersing or emulsifying agents of the ionic or non-ionic type, for example sulphoricinoleates, quaternary ammoniumderivatives or products based on condensates of ethylene oxide, such as the condensates of ethylene oxide with octylphenol, or fatty acid esters of anhydrosorbitols which have been rendered soluble by etherification of the free hydroxyl groups by condensation with ethylene oxide. It is preferable to use agents of the non-ionic type because they are not sensitive to electrolytes.
• the emulsions of the carbamic esters may be used in the form of self-emulsifying concentrates containing the active substance dissolved in the dispersing agent or in a solvent containing a dispersing agent compatible with the active ester, a simple addition of water producing compositions ready for use.
• the solid compositions are preferably prepared by grinding the carbamic ester with the solid diluent, or by impregnating the solid diluent with a solution of the carbamic ester in a volatile solvent, evaporating the solvent and, if necessary, grinding the product so as to obtain a powder.
• the isocyanate starting materials employed in Examples I to V are prepared by the method of Vittenet, Bull. Soc. Chim. 21, 586 and 954 (1899).
• the substituted lactamide starting materials are prepared in accordance with Ratchford, Org. Chem. 15, 326 (1950), and Ratchford and Fischer, J. Am. Chem. Soc. 69, 1913 (1947).
• EXAMPLE VII A mixture of D(+)N-methyl-lactamide (23 g.) and 3-chlorophenyl isocyanate (30.7 g.) in benzene (100 cc.) is heated under reflux for 7 hours. After cooling, the solid formed is taken up in distilled water (200 cc.). After drying in vacuo over sulphuric acid and recrystallisation from 50% (v./v.) ethanol, there is obtained D()2 (3 chlorophenylcarbamoyloxy) N methylpropionamide (41 g.), M.P. 157158 C.;
• 26.5 (c. 5, water).
• Examples XIV to XVII in which parts are parts by weight, illustrate herbicidal compositions according to the invention.
• the compositions may be used, after dilution with water to give 0.005 to 50% by weight of ester, to destroy, for example, foxtail among rapeseed, Setaria among lucerne and Digitaria among clover.
• Barley seeds (Aurora variety) are placed on moist cotton for germination for 24 hours. The roots are then 5 2 mm. in length. I These germinated barley seeds are then placed, 35 per dish, into Petri dishes 14.5 cm. in diameter, each containing 30 cc. of a solution with the desired concentration of the product to be tested. Three days later, the length of each main root is measured. The mean length of the 30 longest main roots is then determined and compared with the mean length of the main roots of the comparative seeds, which were placed in twice-distilled water. The ratio between the length of the roots of the seeds treated and that of the comparison seeds is determined.
• Carbamic esters selected from the class consisting of the racemic and optically active D forms of carbamic esters of the formula:
• Ar is a member selected from the class consisting of phenyl and chloro-substituted phenyl and R represents and alkyl group of 1 to 4 carbon atoms.
• Ar is a member selected from the class consisting 8.
• the quantity of said carbamic ester being between 0.005 5 and 50% by weight of the composition. No references cited.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Agricultural Chemicals And Associated Chemicals (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

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Country Status (8)

Cited By (7)

Families Citing this family (3)

Family Cites Families (3)

• 0
  • NL NL257972D patent/NL257972A/xx unknown
  • BE BE597035D patent/BE597035A/xx unknown
• 1959
  • 1959-11-17 FR FR810319A patent/FR1249434A/fr not_active Expired
• 1960
  • 1960-08-05 FR FR835108A patent/FR78254E/fr not_active Expired
  • 1960-11-09 DE DES71195A patent/DE1297093B/de active Pending
  • 1960-11-15 CH CH1277060A patent/CH408531A/fr unknown
  • 1960-11-15 GB GB39241/60A patent/GB959204A/en not_active Expired
• 1962
  • 1962-10-04 US US228243A patent/US3177061A/en not_active Expired - Lifetime
• 1964
  • 1964-12-31 OA OA51855A patent/OA01393A/xx unknown

Non-Patent Citations (1)

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